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Tropical Storm Helene may be battling wind shear but it’s caused a Tropical Storm Warning for all of the Azores Islands on Sept. 15. NASA-NOAA’s Suomi NPP satellite passed over the eastern Atlantic Ocean and analyzed the storm.

Tropical Storm Helene may be battling wind shear but it’s caused a Tropical Storm Warning for all of the Azores Islands on Sept. 15. NASA-NOAA’s Suomi NPP satellite passed over the eastern Atlantic Ocean and analyzed the storm.

Southwesterly shear continues to affect now Tropical Storm Helene as it nears the Azores. In general, wind shear is a measure of how the speed and direction of winds change with altitude. Winds at different levels of the atmosphere pushed against the cylindrical circulation center and skewed it, weakening the rotation.